The issue was caused by the alpha animation applied to the bubble bar.
Added code to check if the alpha applied to the bubble bar is less than
1 and instruct child bubble views not to provide a shadow outline in
such cases. While this is not a full fix, but rather an improvement,
b/345490679 should introduce a proper fix.
Bug: 345484712
Test: visual - go to any application and stash/unstash bubble bar
Flag: com.android.wm.shell.enable_bubble_bar
Change-Id: Icb6bdb009f4d5998ec1638f97de89f7a4c9feccf
mpodolian
6ba541642e